Practice Arena

Choose a System Design Challenge

Select a system design question, model your architecture in the playground, and let the AI interview you.

easy

HashingNoSQL+2

Design a system that generates a short, unique alias for a long URL and redirects users to the original URL when accessed.

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easy

Message QueuePub/Sub+2

Design a scalable service to send real-time alerts, emails, push notifications, and SMS messages to users.

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medium

RedisMiddleware+2

Design a highly available and distributed rate limiting system to protect downstream services from excessive traffic.

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medium

WebSocketsPub/Sub+2

Design a real-time instant messaging service supporting one-on-one and group messaging, file transfer, and active/idle presence status.

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medium

Distributed QueueDNS Resolver+2

Design a distributed system that crawls the web, parses HTML pages, and stores extracted content for a search engine index.

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hard

CDNVideo Transcoding+2

Design a video streaming platform that supports low-latency, adaptive video playback for millions of concurrent users.

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hard

Geospatial IndexingWebSockets+2

Design a system to track real-time driver locations, match riders with nearby drivers, and compute dynamic route ETAs.

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hard

LRUConsistent Hashing+2

Design a high-performance, distributed key-value storage system like Redis or Memcached with replication and partition tolerance.

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